Crusher



UNITED STA Patented May 18, 1926.

ALBERT H. STEBBINS; DE LOS ANGELES, CALIFORNIA.

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Application filed June 15, 1922. Serial No. 568,384.

The invention to be hereinafter described relates to gyratory crushers.

One feature of the present invention resides in a crusher consisting of a casing provided with an inner crushing wall, and hav ing a shaft supported for free swinging movement within the casing and provided with a crushing surface that cooperates with the crushing wall of the casing to crush materials.

Another feature of the invention resides in a crusher consisting of a casing having an inner crushing wall, and a shaft within the casing provided with a crushing surface and having an unbalanced wheel secured to the shaft to impart a gyrating movement to the shaft by the unbalanced rotation of the wheel.

Another feature of the invention resides in means for rotating the unbalanced wheel upon the shaft which supports it.

Other features of the invention and novel combination of parts in addition to the ab ve will be hereinafter described in connection with the accompanying drawings which illustrate a good practical form thereof.

In the drawings:

Fig. 1 is a vertical sectional view through a crusher constructed in accordance with the present invention;

Fig. 2 is a top plan view of the crusher of Fig. 1; a

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 1; and

' Fig. 4 is a vertical sectional View showing a modification of the invention.

In the embodiment of the invention shown in Figs. 1, 2 and 3, a cylindrical casing 16 is provided which rests upon a supporting frame 11 and the casing 10 may be secured to the frame by bolts 12 extending through laterally projecting flanges 13 of the casing. Vvithin the casing 10 is provided a lining or crushing wall 14 which preferably may be removed and replaced by a new crushing wall when the old one becomes worn.

A shaft 15 extends within the casing 10 and has mounted thereupon a roller or crushing surface 16 which cooperates with the crushing wall t to crush the materials being treated. The shaft 15 supports its roller 16 so that the roller may be moved within the casing 10 with a gyratory movement, and to his end in the present case the shaft 15 is supported at its upper end for free swinging movement within the casing 10. In the present construction a bracket 17 is supported above the casing 10 and in spaced relation thereto by upright posts 18 the lower ends of which are mounted in sockets formed in a flange 19 surrounding the upper portion of the casing 10 and the bracket 17 rests upon shoulders adjacent the upper ends of the posts 18 and may be secured thereupon by the nuts 20. The upper portion of the shaft 15 preferably is threaded and has secured thereupon a bearing member 21 which is preferably semi-spherical in configuration and this bearing member is seated in a correspondingly shaped socket formed within the bracket 17 As a result of this mounting, the shaft 15 is supported by the bracket 17 for rotation and also for swinging movement. The roller or crushing surface 16 surrounding the shaft 15 preferably is removably mounted upon this shaft so that it may be removed and replaced by a new roller when the old one becomes worn, and to this end the shaft 15 has a sleeve 22 sweated or otherwise rigidly secured thereto below the roller 16 so that this roller may rest upon and be supported by the sleeve 22. In the present case the roller 16 is shown as having the shape of a frustum of a cone and is formed of a number of separate disks 23 which may be slipped over the upper end of the shaft 15 when the same is removed from the crusher; and moved downwardly upon the shaft until they are supported by the sleeve 22, and the shaft 15 preferably is provided with a key 24 which prevents the disks 23 from rotating upon the shaft.

As a result of the mounting of the shaft 15 described, this shaft is free to rotate and to swing aboutits upper supporting bearing, so that the axis of this shaft will move in a path to generate a cone.

' Different means may be provided for imparting a-swinging or gyratory movement to the lower end of the shaft 15 to effect crushing of the materials between the inner wall lt and the roller 16, and in the present case the desired movement is imparted to the shaft 15 by an unbalanced wheel 25 mounted thereupon near the lowerend of the shaft. It is preferable that the shaft 15 be free to rotate independently of the unbalanced wheel 25, and to this end the unbalanced wheel is rotatably mounted upon the shaft 15 and is driven by a second shaft 26 which extends through the shaft 15. The shaft 26 may be driven by a pulley 27 secured to the upper end of this shaft and having a belt 28 passing around the pulley, and rotative movement is imparted from the lower end of the shaft 26 to the unbalanced wheel 25 by a spider 29 which may be keyed to the shaft 26 as at 30 and may have outwardly extending arms secured to the wheel 25 by bolts 31. The weight of the unbalanced wheel 25 preferably is carried by the outer shaft 15 and to this end the unbalanced wheel may rest upon a ball bearing 32 which is supported by a nut having threaded engagement with the lower end of the shaft 15. As a result of this construction, the shaft 26 which is rotated at a relatively fast speed, may be made comparatively light since it is not required to support the weight of the unbalanced wheel, and is not subjected to the lateral strains which the unbalanced wheel imparts to the outer shaft 15. As stated, the outer shaft 15 is free to rotate independently of the inner shaft 26 and unbalanced wheel 25, and a result the shaft 15 in most cases will rotate slowly as the rolled 16 travels about the interior of the casing 10 with a gyratory movement.

The materials to be crushed may be directed into the casing 10 by a chute 3 1 and the upper face of the unbalanced wheel 25 is preferably covered by a plate 35 upon which the materials fall as they escape from the lower end of the crusher and these materials will be thrown outwardly by centrifugal force imparted thereto by the rotating wheel 25, and will strike against the walls of the surrounding chamber 36 and move downwardly therein. The unbalanced wheel 25 may be given various constructions to form one side of the same heavier than the other, and, in the present case, the aperture formed in this wheel to receive the shaft 15 is disposed eccent-rieally of the wheel, as will be apparent upon observing the dotted circle 37 of Fig. 3, which circle is concentric with the shaft 15. The sleeve 22 preferably has an outwardly extending flange 38 at its lower end which serves to prevent dust and dirt from reaching the bearing between the unbalanced wheel 25 and the shaft about which it rotates.

The inclination of the cooperating crushing walls of the present machine may be varied as desired, and in the modification of Fig. i a construction is shown in which both crushing walls taper upwardly. The crusher of Fig. 4,- is provided with a supporting frame 39 upon which a casing 40 is mounted, and this casing has a lining or inner wall 41. The shaft 42 extends through the casing 40 and is supported at its upper end for swinging movement by a frame 43 mounted upon the casing 40 and extending upwardly therefrom, and the lower end of the shaft 42 is provided with an unbalanced wheel 43 which is rotated upon this shaft by an inner shaft, the same as in Fig. 1. The upper portion of the casing -10 preferably flares outwardly as at 44; to direct the materials toward the crushing surfaces, and a chute 45 directs the materials into the *asing 40. The general construction and operation of the crusher of Fig. -1 may be thesame as that disclosed in Figs. 1, 2 and 3 except thatthe cooperating crushing walls of the casing -10 and roller 46 taper upwardly in the form of a frustum of a cone, as will be apparent from the drawing. In each of the constructions shown, rotation of the unbalanced wheel will impart a gyratory movement to the lower end of the roller supportingshaft and this will cause the roller to travel about the interior of the casing 10 or 4-0 with a crushing and rolling effect. and as a result of this operation the materials to be crushed will move down wardly upon one side of the crushing roller throughout: its gyratory movement. while other materials are being crushed between the opposite side of the roller and the inner lining of the casing 10 01* 10.

hat is claimed is:

l. A gyratory crusher comprising in combination, a casing provided with an inner crushing wall, a hollow upright shaft suspended from an upper bearing to rotate in the casing with gyratory movement and having a crushing surface slurrounding the shaft and positioned to cooperate with said inner wall, unbalanced weighted means mounted upon the shaft to impart gyratory movement to the shaft and crushing surface upon rotation of said means, and a second shaft mounted within the hollow shaft for rotating said means.

2. A gyratory crusher comprising in combination, a casing provided with an inner crushing wall, a shaft suspended from an upper bearing to rotate in the casing with gyratory movement and having a crushing surface positioned to cooperate with said inner all. an unbalanced weight rotatably carried by the shaft, and means for rotating the weight at a speed in excess of the speed at which the shaft rotates to impart gyratory movement to the shaft.

In testimony whereof, I have signed my name to this specification.

ALBERT H. STEBBINS. 

